6211 2ZR 55x100x21 Shielded Ball Bearing6211 2ZR Bearing Shielded Ball Bearing 55mm x 100mm x 21mm 6211 2ZR Shielded Ball Bearing,bearing is made from Chrome Steel, each bearing has Metal Shield to protect the bearing from dust or any possible contamination, 6211 2ZR is self lubricated bearing (bearing is already greased). 6211 2ZR Ball Bearing Bearing Inner Diameter: 55mm Bearing Outer Diameter: 100mm Bearing Width: 21mm Deep Groove Ball Bearing Shield Double Metal Shields for dust